Transmitting apparatus.



HQ SHOEMAKER.

TRANSMITTING APPARATUS.

APPLIUATION FILED DEG.10,1908.

Patented July 6, 1909.

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To all whomdt may concern:

Bericknownfthet l, I'IARRY Si-IQEMAKER', a

citizenw0f -theJUnited States, residing at' Jersey ity, in: tlie:='county of Hudson and Stateofntewrinlelsey, have invented a new and u'stlul-llrans fitting Apparatus, of which the following-tie a Specification.

Myinventionrelates to the control of substantial amounts of electrical energy, refer-- ably a signaling system and prefera 1}; by a telegraph key, whereby the hey is required to contrpl only affection of the entire energy used i n re n es'en'ting a signal or message.

- ergy pnsses t second pair 'ltis tlre obje ct' oi" my invention to control electrica' e1 1e'i 'gy*-' "sulistantial quantities, particular hen n the alternating "form, as usedin t-h mnsnrittingapparatus of a wire'-' less tele'gl plr'f-01 0tl1ei' system, where the afiiount of ene rg-yto be controlled is relatively great g'antlyet'to be whiclronljs afsmhllftractioi'rol' the entire en- 'e'prese'nt dots anddashes or otlierclrara zter To this end, I. provide 'elatcd inductauces, an

lnductai on pair beiug always in. circult inductance 01 thatpair s with an imluctmiee o'l' beingemu-011ml by the key And this arrangement of inductaneesmay be carrred'but are "great a number of pairs as desire tlo resides also in other features here at, pointed out and claimed."

1 rll'ustration of some of the forms my eke reference is to be hadjco 'z'r wing, 111 which: diagranunatlc vlewof a wireless telegraph transmitter inyol'ving my 1nvent'lb in this showing only two pairs of in ctiinc'es; l igg 2 is a diagrammaticvim llu'stratin' a arrangement in which a A pairsof cont-roll1ng induct- 0V1 ed.-"F1g.' 3 illustrates a elosed magneticfcircuit for th ndn ctancp Fig." lllnsti' p 1 Specification of Letters Patent. ,Application filed Decemb'er 10, 1908. Serial 110.466,!!! ,I

ontroll'ed by a k ey tl irough ether inductance of the the lee omitt ng sT rns PATENT onnron,

teni' snommigun, OF JERSEY CITY, NEW Jnnsnyd 'urn'ansmmmo ArPAnA'rUs.

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serially connected urith each other endin' parallel with inductance L. 'By'thc closure of theoperators heyk, the inductance I is; thrown into circuit and in parallel with the inductance L. Y r I y The lnductances L and L are disposed upon the core 0, and are difierentiall 'wound or connected and are preferably siml ar'inlresistanoe and am ere turns And, similarly, the inductances 3 and L are disposed, 1n relation to the core C, are dlfi'ere-ntially wound orconnected, and are preferably similar resistance and ampere turns:

The secondary S, of the transformerj'l, is"

bridged by the condensers- K and K; and these by a spark gap 8 anclthe adjustable inductance I. r j A is the aerial conductor, of any suitable form, of a wireless telegraph t ransliiitting station, between which and the earth connection E is connected at variable portion of the nductance I.

The inductance L 1s always in circuit with the generator G and the primary, P. And

the inductancesL andL are also always in, circu t, being connected in serles wlth each other and in parallel with the inductance L When thekey Is 1s depressed current \Ylll-itlSO flowthrough the inductive winding or inductg anc-e L, but since these coils are indifi'eren tial relation with respect to eachother, and if the are substantially similar in magnetizr in; etl ects,

the inagnetizini efi'ect upon thw core C? becomes practicaly zero andth yahie of the combined self-induction ofthei inductanccs L and L is reduced t0'prac'ti;:" callyzgn'o, and, in consequence, ai'very much greater"current "will flow through the inductance L Thus, great-er currentpa'ssing through L then serves; with the current t-hrouglrL in opposition, to render the mag netization of the core C practically zero, causing still greater current to flow. And the" key k causes"afrcduction of practically zero in the c offthdpair Bet e w ly "that are:

erawar the inductance to fi e- 131 i will, in consec uence, flow through the primary-P and thus supply a relatively great amount of energy to the oscillation circuit including'the condensers K, K and the-inductance I. While it'is preferred to have the pairs L and L and L and L.similar in resistance, inductance, number of turns, etc., it is to be understood that they may be dissimilar in these regards though the greater effect will be produced when they are so similar. And while there is current passing through the primary P even when the key 7c is open yet such amount of current is small and may, indeed, be so small as to be incapable of causing sparking at s. For example, a current of 25 amperes through inductance L when the key'k is closed, and a like current of 25 amperes through L nets a cur-. rent of 50 amperes through the inductance L and with a current of 50 amperes through L nets a current of 100 amperes through the primary P In such case, the key 71' is required to handle or control only a quarter of the current. When the key it is open no current passes through L and the inductances L? and L being in series permit a very small amount of current to pass and the inductance L also chokes back the current allowing only a very small current to pass. Indeed, in the case above given with the key 7: open, the current through the primary P was approximately only 5 amperes, but this can be made even smaller by giving the windings or inductances L L etc., a greater number of turns or greater inductance.

In Fig. 2 theparts are the same as shown in Fig. 1, except that three pairs of inductancesare shown; The pairs L, L with core C, and L and L with core 0 are the same as shown in Fig. 1. But instead of having the inductance L connected through the key It, it connects permanently through the inductance If of the third air and when the key It is closed, throng 1 the inductance L also, the pair L L being disposed upon the core Here again the action is the same as in the case of Fig. 1. The closure of the key 7c causes the differential air L, L to become practically non-in uctive; this causes, then, the pair L and L to become practically noninductive; and, in turn, the pair L and L becomes practically non-inductive so that there will flow a very much" greater current through the primary P. For example, with the key It closed I have found that a current of 25 amperes will flow through both L and L; a current of 50 amperes through both L and L and a current of 100 amperes through both L and L thus netting a current of 200 amperes through the primary 1. Here it is seen that the key la is required to handle or control only one-eighth of the entire current.

While the cores 0 may take an y suitable form, they are preferably laminated, and in.

way.

In Fig. 4 a casing or container M is shown in cross section with the cores (J, C, shown in end elevation supported or secured within the casing M. By thus usingclosed magnetic circuit cores, the inductances being brought in close proximity to each other, will not influence each other except in an inappreciable degree.

M hat I claim is:

1. In transmitting aratus, the combination with a source of ener of a plurality of pairs of differentially related inductances associated with said source, an inductance of each pair .connected in series with each other, an inductance of a pair connected in parallel with said serially con nected inductances, and a transmitter for controlling an inductance of a pair.

2. In transmitting ap aratus, the combination with a source 0 energy, of a plurality of pairs of differentially related inductances associated with said source, an inductance of each pair connected in series with each other, an inductance of a pair connected in parallel with said serially connected inductances, and a transmitter for controlling an inductance associated in a pair with one of said serially connected inductances. Y

3. In transmitting ap aratus, the combination with a source 0 energy, of a plurality of pairs of differentially related inductances associated with said source, an inductance of a air being connected, in series with an in uctance of another air, and a transmitter for controlling an in. netance in parallel with said inductance of another pair.

4. In transmitting apparatus, the combination with a source of energy, 01'' a plurality of pairs of differentially related inductances associated with said source, and a transmitter for controlling an inductance of a pair, vihereby the combined inductance of that pair is greatly reduced and the consequent increased current greatly reduces the combined inductance of another pair.

5. In transmitting apparatus, the combination with a source of energy, of a plurality of pairs of di'll'erentially related inductances associated with said source, an inductance of one pair connected in j series with an inductance of another pair, and a transmitter for controlling an inductance of; a pair, whereby the combined inductance of that pair is greatly reduced and the consequent uncreased current greatly reduces the combined inductance of anotherpair.

6. In transmitting apparatus, the combination with a source of energy, of a plurality of pairs of differentially related inductances associated with saidsource, an inductance of each pair having a terminal in common with an inductance of eve associated with said source, an inductance of one pair eonnected'in series with an inductance of anotherpalr, the second mductance of another pair connected in series with an inductance of the third (pair, and .a

transmitter for controlling an in tance of a pair.

8. In transmitting apparatus, thecombination with a source iofenerg'ymf a plurality of pairs of differentiallyrelated inductances associated with said source, an inductance of I each pair ha a common terminal, an inductance' of'ea'c pair connected at its uncommon terminal through the inductance of a another pair, and atransmitter forcontrolling an inductance of a pair.

9. In transmitting apparatus, the .conihination with asource of energy, of a plurality of pairs of difierentially related inductances associated therewith a closed-magnetic circuit for each pair of inductances, the pairs of inductances with their closed magnetic circuits being placed in proximity to each 1 other, and a transmitter for controlling an inductance of -a pair. I i

10. In transmitting apparatus, the combination with a source of energy, of. a plurality of pairs of differentially related inductances associated therewith, -a closed ma cuit for each pair of inductances, t e pairs of inductances with their closed magnetic circuits being placed in proiimity to each other, a cas' inclosingsaid pairs of inductances, an a'ke for bringing into circuit an inductance 0' a pair.

' 11. In transmitting apparatus, the combination with a source of energy, of a plurality of pairs of differentially related inductances associated therewith, a of inductances having a, closed ticcircuit, said pair of inductances with its closed magnetic circuit disposed inproximity to another pair of inductances, and a key for bringing into circuit an inductance of a pair.

12.111 transmitting apparatus, the combination with a source of current, of a lurality of pairs of diflerentially related in .uctances associated therewith, a transmitter for controlling aninductance of a pair, the arrangement of said pairs with respect to eachother such that the increased current resultm the reduction of the combined in ductance of a air shall 0 erate to reduce the combined in uctance o another pair to further increase the total current.

In testimony whereof I' have hereunto affixed'my signature in the presence of the two subscribing witnesses.

HARRY SHOEMAKER. "Witnesses: M. F. CARROLL,

B. J. MOCABE. 

